Unimanual to bimanual: Tracking the development of handedness from 6 to 24 months
Unimanual to bimanual: Tracking the development of handedness from 6 to 24 months
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DOI：
10.1016/j.infbeh.2013.01.009
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发表时间：
2013-04-01
影响因子：
2.1
通讯作者：
Michel, George F.
中科院分区：
文献类型：
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作者：
Nelson, Eliza L.;Campbell, Julie M.;Michel, George F.
在生命的头两年，手的技能发生了巨大的变化，这对研究利手发展的研究人员来说是一个有趣的挑战。到目前为止，大量的工作都集中在从伸手到走路的单手技能上。目前的研究试图连接这种早期单手使用后来的角色分化双手操作（RDBM），其中一只手稳定的对象，另一只手的行动。我们研究了38名儿童的手使用超过16个月的访问使用一个有效的措施，以评估手的偏好，以获取对象时，儿童是6-14个月大。我们还开发了一个新的措施，用于评估RDBM偏好时，儿童18-24个月大。新的措施可靠地引起RDBM行动在幼儿和成人对照组（N=15）。结果显示，一些儿童表现出偏好获取对象作为婴儿，这些偏好是稳定的，并坚持到他们的第二年，新的技能出现。此外，在婴儿期没有用手偏好的儿童在蹒跚学步时转向使用左侧或右侧手。尽管与成人标准相比，左撇子的发生率较高，但大多数儿童在2岁时都是右撇子。(C)2013 Elsevier Inc. All rights reserved.
Manual skills change dramatically over the first two years of life, creating an interesting challenge for researchers studying the development of handedness. A vast body of work to date has focused on unimanual skills during the period from the onset of reaching to walking. The current study sought to connect such early unimanual hand use to later role-differentiated bimanual manipulation (RDBM), in which one hand stabilizes the object for the other hand's action. We examined hand use in 38 children over 16 monthly visits using a validated measure for assessing hand preference for acquiring objects when children were 6-14 months old. We also developed a new measure for assessing RDBM preference presented when children were 18-24 months old. The new measure reliably elicited RDBM actions in both toddlers and an adult control group (N=15). Results revealed that some children show preferences for acquiring objects as infants; these preferences are stable and persist into their second year as new skills appear. Moreover, children with no hand preference during infancy shifted to left or right lateralized hand use as toddlers. Despite a higher incidence of left-handedness compared to adult norms, the majority of children were right-handed by 2 years of age. (C) 2013 Elsevier Inc. All rights reserved.